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Summary: Ctors | Methods | Inherited Methods

# XPathException

`public class XPathException`
`` `` `extends Exception` ``

java.lang.Object
↳ | java.lang.Throwable
| ↳ | java.lang.Exception
|  | ↳ | javax.xml.xpath.XPathException

Known direct subclasses XPathExpressionException, XPathFactoryConfigurationException
XPathExpressionException | `XPathExpressionException` represents an error in an XPath expression.
XPathFactoryConfigurationException | `XPathFactoryConfigurationException` represents a configuration error in a `XPathFactory` environment.

Known indirect subclasses XPathFunctionException
XPathFunctionException | `XPathFunctionException` represents an error with an XPath function.

`XPathException` represents a generic XPath exception.

## Summary

### Public constructors
`XPathException(String message)` Constructs a new `XPathException` with the specified detail `message`.
`XPathException(Throwable cause)` Constructs a new `XPathException` with the specified `cause`.

### Public methods
`Throwable` | `getCause()` Returns the cause of this throwable or `null` if the cause is nonexistent or unknown.
`void` | `printStackTrace()` Prints this throwable and its backtrace to the standard error stream.
`void` | `printStackTrace(PrintWriter s)` Prints this throwable and its backtrace to the specified print writer.
`void` | `printStackTrace(PrintStream s)` Prints this throwable and its backtrace to the specified print stream.

### Inherited methods
From class `java.lang.Throwable`
`final void` | `addSuppressed(Throwable exception)` Appends the specified exception to the exceptions that were suppressed in order to deliver this exception.
`Throwable` | `fillInStackTrace()` Fills in the execution stack trace.
`Throwable` | `getCause()` Returns the cause of this throwable or `null` if the cause is nonexistent or unknown.
`String` | `getLocalizedMessage()` Creates a localized description of this throwable.
`String` | `getMessage()` Returns the detail message string of this throwable.
`StackTraceElement[]` | `getStackTrace()` Provides programmatic access to the stack trace information printed by `printStackTrace()`.
`final Throwable[]` | `getSuppressed()` Returns an array containing all of the exceptions that were suppressed, typically by the `try`-with-resources statement, in order to deliver this exception.
`Throwable` | `initCause(Throwable cause)` Initializes the cause of this throwable to the specified value.
`void` | `printStackTrace()` Prints this throwable and its backtrace to the standard error stream.
`void` | `printStackTrace(PrintWriter s)` Prints this throwable and its backtrace to the specified print writer.
`void` | `printStackTrace(PrintStream s)` Prints this throwable and its backtrace to the specified print stream.
`void` | `setStackTrace(StackTraceElement[] stackTrace)` Sets the stack trace elements that will be returned by `getStackTrace()` and printed by `printStackTrace()` and related methods.
`String` | `toString()` Returns a short description of this throwable.
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Public constructors

### XPathException

    public XPathException (String message)

Constructs a new `XPathException` with the specified detail `message`.

The `cause` is not initialized.

If `message` is `null`, then a `NullPointerException` is thrown.

Parameters
`message` | `String`: The detail message.

### XPathException

    public XPathException (Throwable cause)

Constructs a new `XPathException` with the specified `cause`.

If `cause` is `null`, then a `NullPointerException` is thrown.

Parameters
`cause` | `Throwable`: The cause.

Throws
`NullPointerException` | if `cause` is `null`.

## Public methods

### getCause

    public Throwable getCause ()

Returns the cause of this throwable or `null` if the cause is nonexistent or unknown. (The cause is the throwable that caused this throwable to get thrown.)

This implementation returns the cause that was supplied via one of the constructors requiring a `Throwable`, or that was set after creation with the `initCause(java.lang.Throwable)` method. While it is typically unnecessary to override this method, a subclass can override it to return a cause set by some other means. This is appropriate for a "legacy chained throwable" that predates the addition of chained exceptions to `Throwable`. Note that it is not necessary to override any of the `PrintStackTrace` methods, all of which invoke the `getCause` method to determine the cause of a throwable.

Returns
`Throwable` | the cause of this throwable or `null` if the cause is nonexistent or unknown.

### printStackTrace

    public void printStackTrace ()

Prints this throwable and its backtrace to the standard error stream. This method prints a stack trace for this `Throwable` object on the error output stream that is the value of the field `System.err`. The first line of output contains the result of the `toString()` method for this object. Remaining lines represent data previously recorded by the method `fillInStackTrace()`. The format of this information depends on the implementation, but the following example may be regarded as typical:

>      java.lang.NullPointerException
>              at MyClass.mash(MyClass.java:9)
>              at MyClass.crunch(MyClass.java:6)
>              at MyClass.main(MyClass.java:3)

This example was produced by running the program:

     class MyClass {
         public static void main(String[] args) {
             crunch(null);
         }
         static void crunch(int[] a) {
             mash(a);
         }
         static void mash(int[] b) {
             System.out.println(b[0]);
         }
     }

The backtrace for a throwable with an initialized, non-null cause should generally include the backtrace for the cause. The format of this information depends on the implementation, but the following example may be regarded as typical:

     HighLevelException: MidLevelException: LowLevelException
             at Junk.a(Junk.java:13)
             at Junk.main(Junk.java:4)
     Caused by: MidLevelException: LowLevelException
             at Junk.c(Junk.java:23)
             at Junk.b(Junk.java:17)
             at Junk.a(Junk.java:11)
             ... 1 more
     Caused by: LowLevelException
             at Junk.e(Junk.java:30)
             at Junk.d(Junk.java:27)
             at Junk.c(Junk.java:21)
             ... 3 more

Note the presence of lines containing the characters `"..."`. These lines indicate that the remainder of the stack trace for this exception matches the indicated number of frames from the bottom of the stack trace of the exception that was caused by this exception (the "enclosing" exception). This shorthand can greatly reduce the length of the output in the common case where a wrapped exception is thrown from same method as the "causative exception" is caught. The above example was produced by running the program:

     public class Junk {
         public static void main(String args[]) {
             try {
                 a();
             } catch(HighLevelException e) {
                 e.printStackTrace();
             }
         }
         static void a() throws HighLevelException {
             try {
                 b();
             } catch(MidLevelException e) {
                 throw new HighLevelException(e);
             }
         }
         static void b() throws MidLevelException {
             c();
         }
         static void c() throws MidLevelException {
             try {
                 d();
             } catch(LowLevelException e) {
                 throw new MidLevelException(e);
             }
         }
         static void d() throws LowLevelException {
            e();
         }
         static void e() throws LowLevelException {
             throw new LowLevelException();
         }
     }

     class HighLevelException extends Exception {
         HighLevelException(Throwable cause) { super(cause); }
     }

     class MidLevelException extends Exception {
         MidLevelException(Throwable cause)  { super(cause); }
     }

     class LowLevelException extends Exception {
     }

As of release 7, the platform supports the notion of suppressed exceptions (in conjunction with the `try`-with-resources statement). Any exceptions that were suppressed in order to deliver an exception are printed out beneath the stack trace. The format of this information depends on the implementation, but the following example may be regarded as typical:

     Exception in thread "main" java.lang.Exception: Something happened
      at Foo.bar(Foo.java:10)
      at Foo.main(Foo.java:5)
      Suppressed: Resource$CloseFailException: Resource ID = 0
              at Resource.close(Resource.java:26)
              at Foo.bar(Foo.java:9)
              ... 1 more

Note that the "... n more" notation is used on suppressed exceptions just at it is used on causes. Unlike causes, suppressed exceptions are indented beyond their "containing exceptions."

An exception can have both a cause and one or more suppressed exceptions:

     Exception in thread "main" java.lang.Exception: Main block
      at Foo3.main(Foo3.java:7)
      Suppressed: Resource$CloseFailException: Resource ID = 2
              at Resource.close(Resource.java:26)
              at Foo3.main(Foo3.java:5)
      Suppressed: Resource$CloseFailException: Resource ID = 1
              at Resource.close(Resource.java:26)
              at Foo3.main(Foo3.java:5)
     Caused by: java.lang.Exception: I did it
      at Foo3.main(Foo3.java:8)

Likewise, a suppressed exception can have a cause:

     Exception in thread "main" java.lang.Exception: Main block
      at Foo4.main(Foo4.java:6)
      Suppressed: Resource2$CloseFailException: Resource ID = 1
              at Resource2.close(Resource2.java:20)
              at Foo4.main(Foo4.java:5)
      Caused by: java.lang.Exception: Rats, you caught me
              at Resource2$CloseFailException.<init>(Resource2.java:45)
              ... 2 more

### printStackTrace

    public void printStackTrace (PrintWriter s)

Prints this throwable and its backtrace to the specified print writer.

Parameters
`s` | `PrintWriter`: `PrintWriter` to use for output

### printStackTrace

    public void printStackTrace (PrintStream s)

Prints this throwable and its backtrace to the specified print stream.

Parameters
`s` | `PrintStream`: `PrintStream` to use for output

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